Title:
RADIO BASE STATION, USER TERMINAL, AND FADING FREQUENCY ESTIMATION METHOD
Document Type and Number:
WIPO Patent Application WO/2014/087773
Kind Code:
A1
Abstract:
The present invention is able to provide a fading frequency estimation method capable of improving mobility of user terminals in a HetNet. This fading frequency estimation method comprises: a step wherein at a radio base station, a mapping format in which reference signals used for estimating a fading frequency at a user terminal within a cell are arranged at a relatively high density is used in at least some of the radio resources allocated to a downlink shared channel to map the reference signals; a step wherein information about the allocation of radio resources for the downlink shared channel is transmitted to the user terminal; a step wherein a fading frequency is estimated at the user terminal on the basis of channel estimation values of the reference signals; and a step wherein the estimated fading frequency is transmitted to the radio base station in response to a transmission request from the radio base station.
Inventors:
TAKEDA KAZUAKI (JP)
NAGATA SATOSHI (JP)
TAKAHASHI HIDEAKI (JP)
ISHII HIROYUKI (US)
NAGATA SATOSHI (JP)
TAKAHASHI HIDEAKI (JP)
ISHII HIROYUKI (US)
Application Number:
PCT/JP2013/079660
Publication Date:
June 12, 2014
Filing Date:
November 01, 2013
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
International Classes:
H04W72/04; H04W16/32; H04W48/16
Domestic Patent References:
| WO2012098827A1 | 2012-07-26 |
Other References:
HIDEHIRO ANDO ET AL.: "Doppler frequency detection using pilot symbols", 2000 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SOGO TAIKAI B-5-59, 7 March 2000 (2000-03-07), XP008179435
3RD GENERATION PARTNERSHIP PROJECT: "3GPP TS 36.300 Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2", 3GPP
3RD GENERATION PARTNERSHIP PROJECT: "3GPP TR 36.81 Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects", 3GPP
See also references of EP 2928249A4
3RD GENERATION PARTNERSHIP PROJECT: "3GPP TS 36.300 Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2", 3GPP
3RD GENERATION PARTNERSHIP PROJECT: "3GPP TR 36.81 Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects", 3GPP
See also references of EP 2928249A4
Attorney, Agent or Firm:
AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)
Hiroyoshi Aoki (JP)
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